RFR (S): add CodeComments functionality to assember stubs

[Lindenmaier, Goetz]

Hi,

The Assembler and CodeBuffer classes supply CodeComment / block_comment()
functionality, which does not work with stubs. The comments are
not printed with +PrintStubCode or +PrintInterpreter because the
comments are lost when the code is turned into a Stub, while
they are kept if the code is copied to a CodeBlob.

We fixed this in our SAP JVM, and contributed the change to the
ppc-aix-port some while ago, see
http://hg.openjdk.java.net/ppc-aix-port/jdk7u/hotspot/rev/d65d0876ab43.

I propose to add this fix to the OpenJDK mainline.
A webrev can be found here:
http://cr.openjdk.java.net/~goetz/webrevs/webrev-comments_in_stubs/

Basically the change passes the codeBuffer to the Stub
constructor, and adapts the disassembler to print the
comments.
In the debug build the  InterpreterCodelet Stub has a new field
holding the code comments.

I also added some ttyLocks and \\ns<file:///\\ns> to beautify the output.

Could somebody please create a bug id for this issue and review the changes?

Thank you and best regards,
  Goetz

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